Serializing and/or Saving the Session

Based on the code, the SkyDriveServiceClient session attribute is defined as "[Serializable()]". However it can't be serialized because of the attribute Credentials and the other attributes are not serializable. Has
anyonealready developedthis feature (session saving/serialization)? Is there any way of saving and restoring sessions without having to perform
repeatedly the logon? I'm trying to save the session in the site's database in order to avoid performing logon each time the client's browser wants
to get any information.